Do not reload the page when no changes have been performed

[Gloumi]

This is frustrating for the user to have a page reload after closing the edit modal box without having made any changes. In a more general way, I think the entire page reload degrades the user experience.

[codesource]

+1 with both remarks

[pxamike]

The problem is how to communicate this from the iframe in the modal back to the frontend editor. It also has to work on different site roots (iframe may have a different domain).

[webian]

Duplicate of #214